Question 1

Which of the following statements best describes an organic molecule?

Accepted Answer

A molecule that contains carbon atoms bonded to hydrogen, and may also contain other elements such as oxygen, nitrogen, or sulfur.

Question 2

Which isotope of hydrogen contains one proton, one neutron, and one electron?

Accepted Answer

Deuterium

Question 3

What is the formal charge on the oxygen atom in the molecule $$\mathrm{CH_3CO_2^-}$$?

Accepted Answer

$$-1$$

Question 4

Which principle states that electrons fill orbitals of lowest energy first?

Accepted Answer

Aufbau Principle

Question 5

In molecular orbital theory, what type of bond is formed when atomic orbitals overlap constructively?

Accepted Answer

Sigma bond

Question 6

Which of the following molecules violates the octet rule?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 7

What is the hybridization of the central carbon atom in $$\mathrm{CO_2$}$$?

Accepted Answer

$$sp$$

Question 8

Which of the following best describes a resonance hybrid?

Accepted Answer

A structure that shows the actual distribution of electrons as a combination of all possible resonance forms.

Question 9

Which of the following molecules contains a net dipole moment?

Accepted Answer

$$\mathrm{CH_3Cl}$$

Question 10

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in a molecule of ethyne ($$\mathrm{C_2H_2}$$)?

Accepted Answer

3 $$\sigma$$ bonds and 2 $$\pi$$ bonds

Question 11

Which of the following is NOT a functional group in organic chemistry?

Accepted Answer

Alkyl

Question 12

What is the molecular geometry of a molecule with 3 bonding pairs and 1 lone pair on the central atom?

Accepted Answer

Trigonal pyramidal

Question 13

Which of the following solvents is polar?

Accepted Answer

Ethanol

Question 14

What is the formal charge on nitrogen in $$\mathrm{NH_4$^+}$$?

Accepted Answer

$$0$$

Question 15

Which rule states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli Exclusion Principle

Question 16

Which of the following best describes the difference between sigma ($$\sigma) $$and pi ($$\pi) $$bonds?

Accepted Answer

$$\sigma$$ bonds result from end-to-end overlap of orbitals, while $$\pi$$ bonds result from side-to-side overlap.

Question 17

Which of the following atoms can have an expanded octet?

Accepted Answer

Sulfur

Question 18

What is the degree of unsaturation for a molecule with the formula $$\mathrm{C_6H_{10}}$$?

Accepted Answer

2

Question 19

Which of the following is the correct condensed structural formula for ethanol?

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$

Question 20

Which of the following molecules has a trigonal planar geometry?

Accepted Answer

$$\mathrm{BF_3$}$$

Chemical Bonding and Molecular Shapes: Foundations of Organic Chemistry

Study Guide - Practice Questions